JPS63149366A - Gas carburizing method - Google Patents
Gas carburizing methodInfo
- Publication number
- JPS63149366A JPS63149366A JP29630386A JP29630386A JPS63149366A JP S63149366 A JPS63149366 A JP S63149366A JP 29630386 A JP29630386 A JP 29630386A JP 29630386 A JP29630386 A JP 29630386A JP S63149366 A JPS63149366 A JP S63149366A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- oxidizing gas
- gas
- oil
- carburizing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005255 carburizing Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims description 24
- 230000001590 oxidative effect Effects 0.000 claims abstract description 27
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 13
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 13
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 12
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000010730 cutting oil Substances 0.000 abstract description 17
- 239000003921 oil Substances 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 44
- 238000004140 cleaning Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- -1 that is Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は被処理品に付着している加工油等の洗浄工程を
不要としたガス浸炭方法風量するもので、極めて経済的
であることを特徴とするものである。[Detailed Description of the Invention] [Industrial Field of Application] The present invention is a gas carburizing method that eliminates the need for a cleaning process to remove machining oil, etc. adhering to a workpiece, and is extremely economical. This is a characteristic feature.
浸炭処理等の熱処理を施す被処理品には生産加工工程で
使用された切削油等が付着している。2. Description of the Related Art Cutting oil and the like used in the production process are attached to products that undergo heat treatment such as carburization.
従来は浸炭処理等の熱処理疋先立って上記切削油等を除
去していた。Conventionally, the cutting oil and the like were removed prior to heat treatment such as carburization.
すなわち、切削油等を付着させたまま浸炭処理等の熱処
理を施すと雰囲気が乱され、均一な処理層が生成されず
、さらに表面に汚点が残る場合等があった。That is, if a heat treatment such as carburization is performed with cutting oil or the like attached, the atmosphere is disturbed, a uniform treated layer is not produced, and there are cases where stains remain on the surface.
そのため、切削油等を除去する方法として、従来洗浄液
を使用する方法（特公昭５６−５８２６号公報号公報−
は切削油を燃焼除去する方法（特公昭５４−３７４３２
号公報）等が採用されている。Therefore, as a method for removing cutting oil etc., the conventional method of using cleaning fluid (Japanese Patent Publication No. 56-5826-
is a method of burning and removing cutting oil (Special Publication No. 54-37432)
Publication No.) etc. have been adopted.
上記洗浄液を使用する方法は必然的に洗浄装置が必要と
なるとともに洗浄液の準備、公害源となる排水の回収等
高価な費用がかかる欠点がある。The method using the above-mentioned cleaning liquid inevitably requires a cleaning device, and has the disadvantage that preparation of the cleaning liquid, collection of waste water which is a source of pollution, etc. are expensive.
また、切削油を燃焼除去する方法は専用の切削油燃焼除
去用炉を準備する必要があり、さらに炉内温度を２００
℃〜４００℃に上昇させなければならず、浸炭処理とは
別に電力消費等経費がかかり経済的とは言えない側面が
あった。In addition, the method of burning and removing cutting oil requires preparing a dedicated furnace for burning and removing cutting oil, and furthermore, the temperature inside the furnace must be raised to 200°C.
C. to 400.degree. C., which is not economical as it requires electricity consumption and other costs in addition to the carburizing treatment.
本発明は上記のごとき欠点を除去したもので、さらにτ
被処理品に付着している切削油を浸炭工程の所期におい
て熱分解させて利用するものであり、極めて経済的であ
るものである。The present invention eliminates the above-mentioned drawbacks, and furthermore, τ
The cutting oil adhering to the workpiece is thermally decomposed and used at the initial stage of the carburizing process, making it extremely economical.
本発明では上記問題点を解決するため、予め、変成炉で
変成したガスを使用することなく、炉内に直接原料ガス
、具体的には炭化水素ガスと酸化性ガスを供給し、炉内
で変成ガスを生成させる方法（特開昭６１−１５９５６
７号公報参照）が採用される。In the present invention, in order to solve the above-mentioned problems, raw material gas, specifically hydrocarbon gas and oxidizing gas, are directly supplied into the furnace without using the gas transformed in the transformation furnace in advance. Method for generating metamorphic gas (JP-A-61-15956
(see Publication No. 7) will be adopted.
すなわち、本発明は炉内に被処理品を装入した後、浸炭
炉内に油脂残留中は酸化性ガスのみを供給して油脂成分
及び析出炭素を減少させ、つぎに炭化水素ガスと酸化性
ガスを供給して浸炭処理を施すものである。That is, in the present invention, after charging the workpiece into the carburizing furnace, only oxidizing gas is supplied while oil remains in the carburizing furnace to reduce the oil and fat components and precipitated carbon, and then hydrocarbon gas and oxidizing gas are supplied. Carburizing is performed by supplying gas.
本発明は切削油等がＣ及びＨを主成分とするものである
ことに着目し、さらにそれらを熱分解させ、油脂成分及
びそれらによって生じた析出炭素を浸炭処理過程で減少
させるものである。The present invention focuses on the fact that cutting oils and the like have C and H as their main components, and further thermally decomposes them to reduce oil and fat components and the precipitated carbon caused by them during the carburizing process.
すなわち、従来から一般に採用されている変成ガスを使
用する方法では炉内にＣＯ，Ｈλ等が存在し、上記切削
油等を炉内で熱分解させることが困難であり、それを強
行するとスーテイング等の現象が生じるものである。そ
こで本発明では原料ガス、すなわち、炭化水素ガスと酸
化性ガスを直接炉内に供給する方法が採用される。In other words, in the conventional method of using a converted gas, CO, Hλ, etc. are present in the furnace, and it is difficult to thermally decompose the cutting oil etc. in the furnace, and if this is forced, sooting etc. This phenomenon occurs. Therefore, in the present invention, a method is adopted in which raw material gases, that is, hydrocarbon gas and oxidizing gas, are directly supplied into the furnace.
したがって被切削油等が付着した被処理品が炉内に装入
された場合、すなわち、初期には酸化性ガスのみを供給
して熱分解させることができるものである。Therefore, when a workpiece with cutting oil or the like attached thereto is charged into the furnace, that is, in the initial stage, only oxidizing gas can be supplied to thermally decompose the workpiece.
詳細に述べると、被処理品の装入から昇温、さらには浸
炭に至る工程において酸化性ガスのみを供給すれば切削
油の熱分解によるＣと酸化性ガス中の０が反応しＣＯあ
るいはｃｏ、！ガスに変化する。In detail, if only oxidizing gas is supplied in the process from charging the workpiece to heating and carburizing, C from the thermal decomposition of the cutting oil will react with 0 in the oxidizing gas, resulting in CO or co. ,! Changes into gas.
もつとも、低温時あるいは一時的に酸化性ガス中の０と
反応ができないＣがある場合には析出炭素が生じる。し
かし、それらも酸化性ガスの供給を継続すると減少させ
ることができる。However, if there is carbon that cannot react with 0 in the oxidizing gas at low temperatures or temporarily, precipitated carbon will occur. However, these can also be reduced by continuing to supply the oxidizing gas.
そして上記油脂成分及び析出炭素の減少状態を酸素セン
サーあるいは赤外線分析計で確認をし、その後の浸炭処
理に問題がない場合に炉内に原料ガス、すなわち、炭化
水素ガスと酸化性ガスを供給し、炉内で変成ガス（ＲＸ
類似ガス）を発生させて処理を行うものである。Then, the state of reduction of the above oil and fat components and precipitated carbon is confirmed using an oxygen sensor or an infrared analyzer, and if there is no problem with the subsequent carburizing process, raw material gas, that is, hydrocarbon gas and oxidizing gas, is supplied into the furnace. , metamorphic gas (RX
The process is performed by generating similar gases.
したがって、本発明によれば独立の切削油除去工程が不
要となるため、そのための各種装置を準備する必要がな
く、さらに原料ガスも節約でき、極めて経済的である効
果が得られるものである。Therefore, according to the present invention, there is no need for an independent cutting oil removal process, so there is no need to prepare various devices for that purpose, and raw material gas can also be saved, resulting in extremely economical effects.
牙１図には本発明をバッチ炉で実施する場合の工程図が
示されている。FIG. 1 shows a process diagram for implementing the present invention in a batch furnace.
同図中、曲線Ａは炉内温度曲線、Ｂは炭化水素ガス供給
曲線、Ｄは酸化性ガス供給曲線、ＥはＣＯコの濃度曲線
である。In the figure, curve A is a furnace temperature curve, B is a hydrocarbon gas supply curve, D is an oxidizing gas supply curve, and E is a CO concentration curve.
矛１図を説明すると、被処理品の装入により炉内温度が
一時的知低下するが、ヒータ表面は７３０℃以上に制御
されており、炉内温度は曲線Ａのごとく、昇温工程（Ｘ
）、浸炭工程（Ｙ）、拡散工程（Ｚ）及び焼入降温工程
図にしたがって制御される。To explain Figure 1, the temperature inside the furnace temporarily decreases due to the charging of the workpiece, but the heater surface is controlled at 730°C or higher, and the temperature inside the furnace increases as shown by curve A. X
), carburizing process (Y), diffusion process (Z), and quenching temperature cooling process diagram.
本発明では昇温工程（力あるいはさらに浸炭工程（Ｙ）
の初期にかげて炭化水素ガスは供給されず酸化性ガスの
みが供給される。In the present invention, the heating process (power or further carburizing process (Y))
At the beginning of the process, no hydrocarbon gas is supplied, and only oxidizing gas is supplied.
すなわち、酸化性ガスとして空気のみが供給される。That is, only air is supplied as the oxidizing gas.
その結果、被処理品に付着して炉内に持込まれた切削油
等が熱分解し、そのＣと酸化性ガス中のＯが反応し、炉
内にはＣＯあるいはＣＯ２ガスが生成される。As a result, the cutting oil and the like that adhere to the workpiece and are brought into the furnace are thermally decomposed, and the C reacts with O in the oxidizing gas, producing CO or CO2 gas in the furnace.
そして、低温時等においてはＣ０，２が増加し炭素の析
出現象も生ずる場合がある。しかしながら、酸化性ガス
の供給を継続すると析出炭素も減少させられる。At low temperatures, C0,2 may increase and carbon precipitation may occur. However, if the supply of oxidizing gas is continued, the precipitated carbon will also be reduced.
そして、例えばＣＯ２濃度を測定し、その後の浸炭処理
に問題がない状態が確認されたら曲線Ｂのごとく、炉内
に炭化水素ガスが供給され。Then, for example, the CO2 concentration is measured, and if it is confirmed that there is no problem with the subsequent carburizing process, hydrocarbon gas is supplied into the furnace as shown by curve B.
さらにそれに合せて必要量の酸化性ガスが供給される。Furthermore, the required amount of oxidizing gas is supplied accordingly.
なお、図面実施例の場合は炉内に供給する炭化水素ガス
を定量とし、酸化性ガスの供給量を制御している。In the case of the embodiment shown in the drawings, the amount of hydrocarbon gas supplied into the furnace is fixed, and the amount of oxidizing gas supplied is controlled.
すなわち、炉内に定量の炭化水素ガスを供給し、炉内に
配置した酸素センサーにより酸素濃度を検出し、該検出
信号により酸化性ガスの供給量を制御しているものであ
る。That is, a fixed amount of hydrocarbon gas is supplied into the furnace, the oxygen concentration is detected by an oxygen sensor placed inside the furnace, and the amount of oxidizing gas supplied is controlled based on the detection signal.
つぎに本発明を連続炉で実施する場合について述べる。Next, a case will be described in which the present invention is implemented in a continuous furnace.
本発明を連続炉で実施する場合には矛２図示のごとき構
造の連続炉が使用される。When the present invention is carried out in a continuous furnace, a continuous furnace having a structure as shown in Figure 2 is used.
すなわち、炉内各ゾーン間に二重のドロップアーチ（１
）をそれぞれ設けてゾーン内の雰囲気を独立させ、昇温
ゾーン（２）には酸化性ガスの供給口（２）を設け、そ
の後の浸炭ゾーン（Ｙ）、拡散ゾーン（Ｚ）及び焼入降
温ゾーン（８）には酸化性ガスの供給口（２）の他に炭
化水素ガスの供給口（３）をそれぞれ設ければよいもの
である（特公昭４９−２９０５５号公報参照）。That is, double drop arches (1
) to make the atmosphere in the zone independent, and the temperature rising zone (2) is provided with an oxidizing gas supply port (2), and the subsequent carburizing zone (Y), diffusion zone (Z) and quenching temperature cooling zone are provided. In addition to the oxidizing gas supply port (2), a hydrocarbon gas supply port (3) may be provided in the zone (8) (see Japanese Patent Publication No. 49-29055).
図中（４）は前室、（５）は攪拌ファン、（６）は焼入
れ油槽である。In the figure, (4) is the front chamber, (5) is the stirring fan, and (6) is the quenching oil tank.
もつとも、ドロップアーチ（１）を設けずに昇温ゾーン
（Ｘ）と浸炭ゾーン（Ｙ）間に開閉扉を設けてもよいも
のである。However, an opening/closing door may be provided between the temperature raising zone (X) and the carburizing zone (Y) without providing the drop arch (1).
本発明によれば、被処理物に切削油等が付着している場
合であってもそのまま浸炭処理を行うことができる。According to the present invention, even if cutting oil or the like is attached to the workpiece, the carburizing process can be performed as is.
したがって、洗浄装置、洗浄液あるいは切削油等の燃焼
除去用炉等が不要であり、それらの維持費、使用経費等
を節約できるとともに浸炭処理のための原料ガスも節約
でき、極めて経済的である効果を有するものである。Therefore, there is no need for cleaning equipment, cleaning fluids, or furnaces for combustion and removal of cutting oil, etc., and it is possible to save on their maintenance and usage costs, as well as the raw material gas for carburizing treatment, which is extremely economical. It has the following.
図面は本発明の一実施例を示すもので、牙１図はバッチ
炉における工程図、牙２図は連続炉の断面図である。
特許出願人 東京熱処理工業株式会社矛１図The drawings show one embodiment of the present invention, and Fig. 1 is a process diagram of a batch furnace, and Fig. 2 is a sectional view of a continuous furnace. Patent applicant: Tokyo Heat Treatment Industry Co., Ltd. Figure 1
Claims (1)
成分及び析出炭素を減少させ、つぎに炭化水素ガスと酸
化性ガスを供給して浸炭処理を行うことを特徴とするガ
ス浸炭方法。A gas carburizing method characterized in that while oil remains in the carburizing furnace, only oxidizing gas is supplied to reduce oil and fat components and precipitated carbon, and then hydrocarbon gas and oxidizing gas are supplied to carry out carburizing treatment. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29630386A JPH0751739B2 (en) | 1986-12-12 | 1986-12-12 | Gas carburizing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29630386A JPH0751739B2 (en) | 1986-12-12 | 1986-12-12 | Gas carburizing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63149366A true JPS63149366A (en) | 1988-06-22 |
| JPH0751739B2 JPH0751739B2 (en) | 1995-06-05 |
Family
ID=17831805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29630386A Expired - Lifetime JPH0751739B2 (en) | 1986-12-12 | 1986-12-12 | Gas carburizing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0751739B2 (en) |
-
1986
- 1986-12-12 JP JP29630386A patent/JPH0751739B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0751739B2 (en) | 1995-06-05 |
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